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Full-Stack Platform Engineering Case Study

Overflow

A multi-channel nonprofit giving platform that helps organizations accept and manage donations across cash, stock, crypto, donor-advised funds, pledges, recurring giving, roundups, and offline gifts.

Overview

Overflow combines donor-facing donation flows, nonprofit admin tooling, payment processing, reporting, reconciliation, and third-party integrations into a unified giving infrastructure platform.

I contributed across the TypeScript monorepo, spanning NestJS backend modules, public API schemas, domain events, queue-backed jobs, React/Next dashboard workflows, donor-facing experiences, shared types, tests, linting, and developer tooling.

Impact

  • Authored 286 non-merge commits across 233 ticket references, touching backend services, frontend apps, shared types, design system components, tests, and tooling.
  • Expanded Overflow public API capabilities across donor profiles, payment methods, contributions, campaigns, subscriptions, one-time charges, response semantics, filters, and typed metadata.
  • Helped deliver location-aware giving, reporting, exports, dashboard access control, and reusable permission abstractions for nonprofit admins.
  • Built and refined nonprofit dashboard workflows for locations, funds, subfunds, API keys, user management, settings, giving links, pledge campaigns, gift entry, and reconciliation.
  • Strengthened backend architecture with CQRS handlers, domain events, saga error handling, queue-backed jobs, repository filtering, test coverage, and type-safety improvements.

Representative Product Areas

Representative panels show the major product and platform areas without representing final Overflow screenshots.

Public API Platform

donors API
payments typed

OpenAPI · DTOs · response semantics

Locations And Permissions

Scope contributions, pledges, exports, reports, and households by accessible locations.
Replace duplicated controller logic with reusable access-control abstractions.

Nonprofit Dashboard

settings · users · funds

Built admin workflows for locations, roles, API keys, funds, subfunds, pledge campaigns, giving links, gift entry, and reconciliation.

Backend Architecture

reliability patterns

CQRS

Domain events, sagas, queue-backed jobs, repositories, and tests.

Tech & Constraints

  • TypeScript
  • NestJS
  • React / Next.js
  • CQRS
  • Domain events
  • Job queues
  • OpenAPI
  • AntD
  • Biome

The key engineering challenge was making complex nonprofit financial workflows safer and more scalable across product surfaces: donor checkout, admin tools, public APIs, permissions, reports, exports, reconciliation, third-party sync, and background work.

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